National Geographic Nature Collection

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"Asteroids: Deadly Impact" - Asteroids and comets: Every year, millions of these "stray bullets" streak through the skies, and tons of small meteorites strike our planet! Some 65 million years ago, dinosaurs were wiped off the face of the earth - in what many believe was the aftermath of a massive cosmic collision. Could something like this happen again? Scientists believe that the impact of an asteroid only a mile wide would be globally catastrophic. Join extraordinary geologist Eugene Shoemaker and his wife Carolyn who have remapped the heavens with their discoveries of more than 30 comets and hundreds of asteroids. Now that we know what's out there, how can we defend ourselves? "Dinosaur Hunters: Secrets Of The Gobi Desert" - In 1922 American paleontologist Roy Chapman Andrews led an archeological expedition into Mongolia's Gobi Desert and uncovered one of the richest dinosaur graveyards in the world. Political conflicts forced him to leave before he had even scratched the surface of the treasure below. In 1997, two paleontologists from the American Museum of Natural History were finally allowed to return, retracing Chapman's steps and unearthing some groundbreaking finds of their own. With spectacular on-location filming, archival footage from Chapman's expedition and impressive computer animation, it's an amazing journey back in time to a lost world where ancient giants once roamed. "SuperCroc" - In the parched Sahara desert, Dr. Paul Sereno uncovers the skull of a ten-ton giant "SuperCroc," the size of a school bus and one of the largest crocs to have lived. Sereno joins forces with reptile expert Dr. Brady Barr for an around-the-globe adventure-packed quest to flesh out this ancient 40-foot croc. Computer animation takes viewers back in time to see how "SuperCroc" might have lived and battled for its food.